— Plate 21. — 



Sh, chief stolon; 5/v, secondary stolon; 5/3, stolon of the third order; /, leaf; rhi, rhizoid; 

 as, air shoot; ic, scape; tr, trap. 



Figs. 1-6. — Jjlricidaria vi.lgan's. 



Fig. I. — Early germination of seeds. 



Fig. 2. — Emergence of primary leaves. 



Fig. 3. — Aberrant seedling. 



Figs. 4 and 5. — Seedlings in advanced stages. 



Fig. 6. — Longitudinal section of seed (after van Tieghem). 



Fig. 7. — Germiination of U. emarginata. A, embryo, above, its apex en- 

 larged; D, embryo with one cotyledonoid a shoot; B, early germina- 

 tion; C, one primary shoot; E, two primary shoots. 



Fig. 8. — Growing point, U. vulgaris. 



Figs. 9 and 10. — Branching, U. vulgaris. Note dwarf branch in leaf axil. 



Fig. II. — U. oligosperma. 



Fig. 12. — U. gilha. 



Fig. 13. ■ — U. intermedia. 



Fig. 14. — The same, with scape. 



Fig. 15. — U . reniformis. 



Figs. 16 and 17. — U . n.inor. 



Figs. 18 and 19. — U. exoleta aS. 



Fig. 20. — U. gibba. 



Fig. 21. — U. bitoba, a leaf-branch. 



Fig. 22. — U. paradoxa (Ms. name); s, level of mud, with water above. 



Fig. 23. — The same. Stiff hair clothing the plant, bifid and quadrifid 

 hairs and a trap (material: Young 1421, in Brit. Mus.). 





